Clean up some docs from the analyzer_plugin package

Change-Id: Iea3e8233641fb294ca1006a7b68178c439cc5e4f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/180780
Auto-Submit: Brian Wilkerson <brianwilkerson@google.com>
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>

pkg/analyzer_plugin/doc/tutorial/assists.md

@@ -102,7 +102,7 @@ class MyPlugin extends ServerPlugin with AssistsMixin, DartAssistsMixin {
   // ...
 
   @override
-  List<AssistContributor> getAssistContributors(AnalysisDriver driver) {
+  List<AssistContributor> getAssistContributors(String path) {
     return <AssistContributor>[MyAssistContributor()];
   }
 }

pkg/analyzer_plugin/doc/tutorial/fixes.md

@@ -117,8 +117,7 @@ class MyPlugin extends ServerPlugin with FixesMixin, DartFixesMixin {
   // ...
 
   @override
-  List<FixContributor> getFixContributors(
-      AnalysisDriverGeneric driver) {
+  List<FixContributor> getFixContributors(String path) {
     return <FixContributor>[MyFixContributor()];
   }
 }

pkg/analyzer_plugin/doc/tutorial/package_structure.md

@@ -56,7 +56,7 @@ analyzer:
 
 If a listed host package can be found (via the `.packages` file associated with
 the target package), then the tool looks in the host package for the folder
-`<host_package>/tools/analysis_plugin`. If that directory exists and contains a
+`<host_package>/tools/analyzer_plugin`. If that directory exists and contains a
 valid bootstrap package, then the bootstrap package is run as a plugin.
 
 ## Bootstrap Package Structure

pkg/analyzer_plugin/lib/plugin/plugin.dart

@@ -95,7 +95,8 @@ abstract class ServerPlugin {
   /// Return the SDK manager used to manage SDKs.
   DartSdkManager get sdkManager => _sdkManager;
 
-  /// Return the version number of this plugin, encoded as a string.
+  /// Return the version number of the plugin spec required by this plugin,
+  /// encoded as a string.
   String get version;
 
   /// Handle the fact that the file with the given [path] has been modified.